Unlock instant, AI-driven research and patent intelligence for your innovation.

Radar apparatus

a technology of radar and beam direction, applied in direction finders, instruments, antennas, etc., can solve the problems of inability to correctly identify the sign of each beat frequency, misidentifying the sign of beam direction,

Active Publication Date: 2010-03-23
MITSUBISHI ELECTRIC CORP
View PDF9 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]According to the present invention, by making it possible for only true frequency components to be summed and for false frequency components not to be summed, the plus or minus sign of the frequencies can be identified by comparison of the magnitudes of the reception levels thereof, thereby making it unnecessary to provide beat frequency combination processing during the increase or decrease of the sending frequency.

Problems solved by technology

In the conventional radar apparatus, it is necessary to identify the polarity or sign of the beat signal frequency in an accurate manner, and unless the sign of the beat frequency could not be identified correctly, there would be a problem of misidentifying the sign of the beam direction, too.
In addition, in case where there exist a plurality of received waves, a plurality of frequency components are generated in each beat signal during the increase and decrease of the sending frequency, but there has been a problem that the sign of each beat frequency is not able to be correctly identified unless the beat frequencies of the individual received waves are correctly combined.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Radar apparatus
  • Radar apparatus
  • Radar apparatus

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0026]Referring to the drawings and first to FIG. 1, there is shown a block diagram of a radar apparatus according to a first embodiment of the present invention.

[0027]In FIG. 1, in order to detect a reflecting object 6, the radar apparatus, generally designated by reference numeral 1, includes, a voltage controlled oscillator 2, a distributor 3, a sending amplifier 4, a sending antenna 5, a plurality of receiving antennas 7, a plurality of receiving amplifiers 8, a plurality of mixers 9, a plurality of beat signal amplifiers 10, a plurality of low-pass filters 11, a plurality of A / D converters 12, and an arithmetic unit 13.

[0028]The voltage controlled oscillator 2 generates an electromagnetic wave of a specific sending frequency ftx (e.g., ftx=76−77 [GHz]), and the distributor 3 distributes electric power of an electromagnetic wave from the voltage controlled oscillator 2 to the sending amplifier 4 and the receiving-side mixers 9.

[0029]The sending amplifier 4 amplifies the electric...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A radar apparatus includes a sending unit for sending a transmission wave, a plurality of receiving parts for receiving a reflected wave from a reflecting object in a parallel manner, beat signal generation parts for acquiring beat signals at the receiving parts, respectively, from the transmission wave and the wave received at the receiving parts, a beat signal processing part for individually processing the beat signals of the receiving parts, a DBF processing part for DBF processing a beat signal processing result, and an object detection part for acquiring information on the reflecting object from frequency components of a DBF processing result or the beat signal processing result. Amounts of phase lag of the receiving parts are set to different values. The beat signal processing part includes a phase correction part that corrects the phase lag amounts corresponding to the individual receiving parts so as to make them equal to one another.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a radar apparatus using an FMCW system, and more particularly, it relates to a technique for avoiding false detection of a reflecting object due to “false frequency components” in a beat signal processing part.[0003]2. Description of the Related Art[0004]In radar apparatuses using a conventional FMCW system, there has been known a technique that synthesizes an antenna beam by applying digital beam forming (hereinafter referred to as “DBF”) processing to individual beat signals obtained from a plurality of receiving parts, and also there has been proposed an apparatus that does not perform IQ detection but Ich detection alone (see, for example, a first patent document: Japanese patent No. 3780904 (page 4)).[0005]In the conventional apparatus described in the first patent document, only the absolute value of a frequency component can be obtained for one received wave, and the plus or minus...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(United States)
IPC IPC(8): G01S13/58G01S13/34G01S13/42
CPCG01S3/48G01S7/4021H01Q3/30
Inventor KAI, KOICHI
Owner MITSUBISHI ELECTRIC CORP